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Re building an engine

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Warsash 2
Posts: 286
Joined: Sun Feb 28, 2016 1:53 pm

Re building an engine

Post by Warsash 2 » Sat Aug 17, 2019 5:28 pm

Hi
I have acquired a V8 engine that had been used by a technical college for student training. The engine number is 7K5617. I am assuming it is from a saloon but their does not appear to be kick down attachment on the cam case. The stamp marks on the pistons are all A except the front right hand one which is stamped B . The letters on the pistons seem to be randomly top and bottom in the bores I understood they should be at the bottom but i do not want to disturb the main bearings if it is no problem. There will no doubt be a lot of other things in the future. Any help would be appreciated. It is over 50 years since I rebuilt engine and then they were Bedford petrol lorry engines so I am very rusty.
Regards
Colin

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Vortex O'Plinth
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Joined: Fri Feb 12, 2016 8:15 pm
Location: Gloucestershire

Re: Re building an engine

Post by Vortex O'Plinth » Sat Aug 17, 2019 5:44 pm

Your engine is almost certainly from a saloon. Saloon engines were numbered with either a 7A or 7H prefix - are you sure yours reads 7K? A quick identifier is the oil filler tube; if it's short and straight it's an SP block, if it's long and 'S' shaped it's from a saloon.

If it has been used for student training I'd suggest you take nothing for granted - a complete strip-down and condition assessment would be very wise. The V8 is fundamentally a simple engine and rebuild should be straightforward. If you have any specific problems I'm sure there will be plenty of help here.
Nick

"Open the pod bay door Hal".

classiclife
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Location: Ridgewood - East Sussex
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Re: Re building an engine

Post by classiclife » Sat Aug 17, 2019 6:17 pm

Hello Nick,

Can I just check the information you have provided please.

My understanding is that saloons have either a 7A or 7K engine prefix - the 2.5 V8 was 7A whereas the later V8-250 having the prefix of 7K.

The S shaped oil filler was used when the saloon was equipped with a single air filter element (2.5 V8) and the straight oil filler tube was used with saloons having twin air filters being the V8-250.

Colin's engine number appears to suggest a late 68 model or perhaps a very early 69.

I fully agree that any student demo engine needs to be fully stripped to ensure all is correct for obvious reasons.

Best wishes.

Richard.
Last edited by classiclife on Sat Aug 17, 2019 9:28 pm, edited 1 time in total.
1968 Daimler V8-250 Saloon
DLOC East Sussex Area Representative.

Southern Classics Society Events Co-ordinator.
www.southernclassics.org.uk

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Vortex O'Plinth
Posts: 826
Joined: Fri Feb 12, 2016 8:15 pm
Location: Gloucestershire

Re: Re building an engine

Post by Vortex O'Plinth » Sat Aug 17, 2019 7:17 pm

classiclife wrote:
Sat Aug 17, 2019 6:17 pm
Hello Nick,

Can I just check the information you have provided please.

My understanding is that saloons have either a 7A or 7K engine prefix - the 2.5 V8 was 7A whereas the later V8-250 having the prefix of 7K.

The S shaped oil filler was used when the saloon was equipped with a single air filter element (2.5 V8) and the straight oil filler tube was used with saloons having twin air filters being the V8-250.

Colin's engine number appears to suggest a late 68 model or perhaps a very early 69.

I fully agree that any student demo engine needs to be fully stripped to end=sure all is correct for obvious reasons.

Best wishes.

Richard.
Thank you for the correction Richard. My reference for the saloon block numbering was Robert Grinter's write up comparing SP250 and saloon engines. Not having actually seen a saloon block myself, I'm sure your identification is correct. I'd forgotten that the V8-250 reverted to a straight oil filler tube, although still somewhat longer than that on the SP.
Nick

"Open the pod bay door Hal".

classiclife
Posts: 397
Joined: Wed Sep 05, 2018 9:55 am
Location: Ridgewood - East Sussex
Contact:

Re: Re building an engine

Post by classiclife » Sat Aug 17, 2019 9:27 pm

Hello Nick,

Phew !!!

Thought I had a SP engine in the saloon at one stage :o

Have to say although RG's article makes good reading, its layout can be confusing if not read over a couple of times to ensure clarity.

All the best.

Richard.
1968 Daimler V8-250 Saloon
DLOC East Sussex Area Representative.

Southern Classics Society Events Co-ordinator.
www.southernclassics.org.uk

Warsash 2
Posts: 286
Joined: Sun Feb 28, 2016 1:53 pm

Re: Re building an engine

Post by Warsash 2 » Mon Aug 19, 2019 11:36 am

Hi
Thanks for your advice. I had assumed it was a saloon engine but confirmation is a great help. As to the lettering on the pistons this appears to be some thing the college must have done. Looking at some old photographs it would appear that the larger, exhaust indentation should be at the bottom and I can disregard the lettering.
Thanks again
regards

Colin

Ian Slade
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Location: Akrotiri Cyprus

Re: Re building an engine

Post by Ian Slade » Mon Aug 19, 2019 2:06 pm

As I understand it only standard bore can have A,B or C pistons whether they are at the top or anywhere else, however as your engine is ex college I would check the bore and remove at least one big end and main to check what you have in way of regrind or condition. Being ex college it will have been continually stripped and rebuilt therefore the bolts may well be overstretched
Owner since the 70's, Genghis is slightly to my left.

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